# Practice Quiz in Digital and Data Communication Networks Part 28

Online Practice Quiz in Digital and Data Communication Networks part 28 as one of the Communications Engineering topic.

This is the Online Practice Quiz in Digital and Data Communication Networks Part 28 as one of the Communications Engineering topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Examination Questions in Electronic System and Technologies, Communications Books, Journals and other Communications References.

### Continue Part XXVIII of the Online Practice Quiz

#### Quiz in Digital and Data Communication Networks

Question 271. Which of the following is correct?

A. The bit rate may be greater than the baud rate

B. The baud rate may be greater than the bit rate

C. The bit and baud rate are always the same

D. The bit and baud rates are not related

Question 272. What is the relationship of bit rate and baud in QPSK and 8-PSK?

A. bit rate is greater than baud

B. bit rate is always less than the baud

C. bit rate is never greater than the baud

D. bit rate is slightly less than the baud

Question 273. For a single-channel PCM system with a sample rate of 6000 samples per second and a seven-bit compressed PCM code, what is the line speed?

A. 21,000 bps

B. 42,000 bps

C. 14,000 bps

D. 12,000 bps

Question 274. The code which provides for parity checks is

A. Baudot

B. ASCII

C. CCITT-2

D. EBCDIC

Question 275. The data rate for IEEE 802.11b is _____.

A. 10 Mbps

B. 1.544 Mbps

C. 2.048 Mbps

D. 11 Mbps

Question 276. Companding is used

A. to overcome quantizing noise in PCM

B. in PCM transmitters, to allow amplitude limiting in the receiver

C. to protect small signals in PCM form quantizing distortion

D. in PCM receivers, to overcome impulse noise

Question 277. It is the only digitally encoded modulation technique that is commonly used for digital transmission

A. PAM

B. PCM

C. PLM

D. PPM

Question 278. Transmissions from multiple sources occur in the same facility but not at the same time

A. Time Division Multiplexing

B. Frequency Division Multiplexing

C. Wave Division Multiplexing

D. Space Division Multiplexing

Question 279. It is the ratio of the largest possible magnitude to the smallest possible magnitude that can be decoded by the digital-to-analog converter in the receiver

A. Coding efficiency

B. Companding

C. Pre-emphasis

D. Dynamic range

Question 280. In order to reduce quantizing noise, one must

A. increase the number of standard amplitudes

B. send pulses whose sides are more nearly vertical

C. use an RF amplifier at the receiver

D. increase the number of samples per second

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